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thanhtien19's avatar
thanhtien19
Iron Contributor
Nov 29, 2023

add one IP to SPF

we just add one IP public to for outbound email , but before that we action some step as below

1. Add this IP (example 20.10.10.1 to spf txt record)

2. create reverse lookup as 20.10.10.1 -> outbound123.test.com

after that test sent email to gmail then ok, but some domain then show problem blow

LED=550-5.5.1 Your server IP address [202.59.252.138] is missing a reverse DNS 550-entry. See                        http://spamauditor.org/best-practices/check-ip-reverse-dns/ for 550-more information.. Protection                       provided by MagicSpam 2.1-19.3 550

I am try check fqdn of send connector then mail.test.com. So to fix need change FQDN of send conenctor the same with reverse lookup is outbound123.test.com ?

Exchange Server

3 Replies

    • thanhtien19's avatar
      thanhtien19
      Iron Contributor
      Nov 30, 2023

      AnnTaeYoun I ask admin manage owner domain and they create dns reverse for our , after we check in this page then ip can reverse to domain and domain can resolve to this ip . 

      do you need need ask ISP ?

       

      • AnnTaeYoun's avatar
        AnnTaeYoun
        MVP
        Nov 30, 2023
        thanhtien19
        There is nothing more to ask from your ISP.

        Verify the FQDN of your send connector.
        Change the FQDN of your send connector to match the reverse DNS entry.